Compressibility of CO adsorbed on Ni(111) from 10-6 mbar to 1.2 bar ambient CO pressures investigated with X-ray diffraction

被引：23

作者：

Quiros, C

Robach, O

Isern, H

Ordejón, P

Ferrer, S

机构：

[1] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[2] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

来源：

SURFACE SCIENCE | 2003年 / 522卷 / 1-3期

关键词：

carbon monoxide; nickel; X-ray scattering; diffraction; and reflection; adsorption kinetics;

D O I：

10.1016/S0039-6028(02)02342-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption of CO on Ni(I 11) surfaces at room temperature has been investigated under equilibrium conditions in ambient CO gas pressures ranging from 10(-6) mbar to 1.2 bar with surface X-ray diffraction. Within this pressure range, ordered structures close to root7 x root7R19.1degrees have been observed to occur. Their lattice parameter was found to change reversibly with the gas pressure by 7.6% within the nine decades pressure range investigated. Ab initio total energy numerical calculations reveal that the compressibility of the adlayer is consistent with a pairwise repulsive force of similar to0.1 eV/Angstrom between neighboring CO molecules. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：161 / 166

页数：6

共 32 条

[1]

Artacho E, 1999, PHYS STATUS SOLIDI B, V215, P809, DOI 10.1002/(SICI)1521-3951(199909)215:1<809::AID-PSSB809>3.0.CO

[2]

2-0

[3] THREEFOLD-COORDINATED HOLLOW ADSORPTION SITE FOR NI(111)-C(4X2)-CO - A SURFACE-EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDY [J].